<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/jquery.js"></script>
    <style>
        .box{
            width: 400px;
            height: 400px;
            background: red;
            position: relative;
        }
        .inner{
            width: 200px;
            height: 200px;
            background: skyblue;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="inner"></div>
    </div>
    <script>
        $(function(){
            $(".inner").offset({left:100})
            console.log($(".inner").offset());
            console.log($(".inner").position());
        })
    </script>
</body>
</html>